Sentences with phrase «under ice sheets»

Apropos of southern polar warming, there may be quite a bit of carbon under the ice sheets: http://theidiottracker.blogspot.com/2012/09/the-antarctic-carbon-feedback-worst.html

Finally, this study does not consider any contribution of methane from methane hydrates, either from under permafrost or under ice sheets, nor from fossil methane currently trapped under an impermeable seal of continuous permafrost.

Probably the fraction under ice sheets was around half.

With the Antarctic sea ice maximum observed this year I wondered if it was due to the sub-surface melt lakes discharging fresh super-chilled water out under the ice sheets.

; — changing of the composition of the ice to the consistency of warm butter so that it is much more mobile; — isostatic rebound; — carbon release from soils now under the ice sheets...

«Water under ice sheets?

But microscopic phytoplankton, which rely on the sun for their nutrients and form the base of Arctic food webs, have managed to thrive under ice sheets that are thinning as the poles become warmer.

Usually, narwhals will escape natural predators such as killer whales by stealthily slipping under ice sheets or huddling in spots too shallow for their pursuers, Williams says.

Under the ice sheet the methane became stored as hydrate, a solid form of frozen methane.

Bamber says that the hidden canyon helps to explain why Greenland does not have any lakes trapped under its ice sheet.

Understanding microbial life and the mineral breakdown that it incites under the ice sheet could help answer some momentous questions about whether global warming will speed up as Antarctica's ice recedes.

Using all available geologic, tectonic and geothermal heat flux data for Greenland — along with geothermal heat flux data from around the globe — the team deployed a machine learning approach that predicts geothermal heat flux values under the ice sheet throughout Greenland based on 22 geologic variables such as bedrock topography, crustal thickness, magnetic anomalies, rock types and proximity to features like trenches, ridges, young rifts, volcanoes and hot spots.

When they retreat, they leave behind a freshly polished, pristine landscape that is markedly different from land that has not been buried under an ice sheet.

«It's like a big beach ball under the ice sheet pushing up on it, and the only way to keep it submerged is if the ice sheet is strong,» said Hemingway, a doctoral candidate in planetary geophysics at UCSC and lead author of the paper.

For the first time, an active volcano has been spotted rumbling away under the ice sheet of west Antarctica.

We suggested that, given the documented flow of water beneath the ice sheet, perhaps sub-glacial rivers carried in the microbes, and Tranter responded, «People would have laughed at you a decade ago, but there is a river system under the ice sheet.

The land under the ice sheet also adds another wrinkle.

Wili, which do you think might have the greater overall melting effect (or the same) when push comes to shove — The height drop or the sea water flows under the ice sheet?

According to the NASA press release, the study «adds evidence that a geothermal heat source called a mantle plume lies deep below Antarctic Marie Byrd Land, explaining some of the melting that creates lakes and rivers under the ice sheet.»

Take up your doubts with NASA and the authors of scientific peer reviewed papers that have identified massive geothermal activity laying under the Ice Sheet.

This entry was posted on Wednesday, August 15th, 2012 at 9:56 am and is filed under ice sheet melt factor.

A new NASA study adds evidence that a geothermal heat source called a mantle plume lies deep below Antarctica's Marie Byrd Land, explaining some of the melting that creates lakes and rivers under the ice sheet.

This is because there is not a topographic low under the ice sheet that funnels the flow.

The piece about the Greenland ice sheet had not a peep about the effect of geothermal activity under the ice sheet and the basal melting that is occurring driving the vigorous subglacial hydrology as outlined in Rogozhina et al, 2016.

So there is liquid water under the ice sheet and this may be increasing the flow rate of the ice.

Christian Schoof, from the University of British Columbia and the study's author, explains that steady flows of meltwater can be accommodated by existing channels under the Ice Sheet, but rapid flows can not:

Not exact matches

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While most duck shooters snuggle deeper under the blankets, the Maine seabirder gets up at 4 a.m., drives his boat through swells that wash over the decks and turn them into sheets of ice, sets his trawl line of decoys, anchors in the lee of a ledge and covers his boat with rockweed.

My final checklist was ice cube trays dumped and filled ten times to make sure we had plenty, the crock pot out and turned on with wash rags in the hot water, the pads put under the sheets that would be the «throw away» set.

The deep grooves under the massive ice sheet could facilitate flow into the ocean, which suggests sea level rise estimates for this century need to be revised upwards

They found that western Antarctica has recently seen warmer, saltier water being driven under the shelf — the part of the ice sheet that sticks out over the ocean (Science, doi.org/xkx).

The days were becoming rapidly shorter as winter approached, and I sat back and imagined the Arctic Ocean, just outside the clinic windows, under a sheet of ice in just a few months.

Finding a layer of ash in the ice wouldn't be surprising: the West Antarctic Ice Sheet straddles a broad continental rift that is known to harbor volcanoes, some of them exposed on the surface and others sealed under iice wouldn't be surprising: the West Antarctic Ice Sheet straddles a broad continental rift that is known to harbor volcanoes, some of them exposed on the surface and others sealed under iIce Sheet straddles a broad continental rift that is known to harbor volcanoes, some of them exposed on the surface and others sealed under iceice.

In effect, this UAV survey across the ablation zone of the ice sheet perfectly bridges the gap between people on the ground studying what's under their feet in just one part of the ice sheet, and the satellite data that shows what's going on across the entire ice sheet.

The paper also describes an atmosphere - ocean modeling study of feedback loops caused by ice sheet melting under 2 °C conditions.

In January 2005, for example, Ohio State University geophysicist Ralph von Frese and his colleagues noticed a concentration of higher - than - average - density material in the rock about a mile under the surface of the East Antarctic ice sheet.

Buried under a sheet of ice 2.5 miles thick, Lake Vostok is the world's seventh - largest freshwater lake and the largest of more than 300 lakes trapped beneath the Antarctic ice sheet.

In contrast to glaciers and ice sheets, which sit on the ground, ground ice sits in the ground, mixed with frozen soil or buried under layers of sediment.

Also in the mid-1990s, another group of scientists proposed the now widely accepted mechanism for how lakes can form under glaciers: Heat radiating from Earth's interior is trapped under the thick, insulating ice sheet, and pressure from the weight of all the ice above it lowers the melting point of the ice at the bottom.

Encased completely within the ice sheet, Camp Century became known as the «city under the ice.»

Hot water drilling still posed challenges: A borehole filled with water would quickly refreeze, and the hole could still collapse shut under the sheer weight of the surrounding ice sheet.

To investigate this, DeConto and Pollard developed a new ice sheet - climate model that includes «previously under - appreciated processes» that emphasize the importance of future atmospheric warming around Antarctica.

A new study led by the University of Texas Institute for Geophysics has found that wind over the ocean off the coast of East Antarctica causes warm, deep waters to upwell, circulate under Totten Ice Shelf, and melt the fringes of the East Antarctic ice sheet from belIce Shelf, and melt the fringes of the East Antarctic ice sheet from belice sheet from below.

Under such conditions, ice sheets melt more strongly than when the surrounding ocean is thoroughly mixed.

Such lakes of water pool at the bottom of an ice sheet or glacier, and were known to be scattered under parts of Antarctica.

Water that collects in valleys underneath the ice sheet, in the Gamburtsev Mountains, refreezes when it passes under thinner parts of the ice sheet that are less insulated from cool surface temperatures.

Radar images show that water under the base of the ice sheet refreezes into ice, creating a new bottom layer that accounts for up to half the total thickness of the ice sheet in some locations.

They expected the detritus would be safely entombed in the ice sheet for tens of thousands of years, buried ever deeper under accumulating layers of snow and ice.

One 2004 NASA - led study found that most of the glaciers they were studying «flow into floating ice shelves over bedrock up to hundreds of meters deeper than previous estimates, providing exit routes for ice from further inland if ice - sheet collapse is under way.»